Tocotrienol-rich fraction from annatto ameliorates expression of lysyl oxidase in human osteoblastic MG-63 cells

Lysyl oxidase (LOX) is required for the formation of bone collagen cross-links. Inactivation of the LOX gene in osteoblasts by DNA methylation and JAK signaling has been reported to cause loss of cross-links and an increased risk of fractures. Tocotrienols (T3s) have proven benefits on bone strength...

Full description

Saved in:
Bibliographic Details
Published in:Bioscience, biotechnology, and biochemistry biotechnology, and biochemistry, 2020-03, Vol.84 (3), p.526-535
Main Authors: Kohno, Kakeru, Yamada, Wakana, Ishitsuka, Aya, Sekine, Miki, Virgona, Nantiga, Ota, Masako, Yano, Tomohiro
Format: Article
Language:English
Subjects:
Bixaceae - metabolism
bone quality
Carotenoids - metabolism
Cell Line
DNA methylation
human osteoblastic cell
Humans
lysyl oxidase
Osteoblasts - enzymology
Osteoblasts - metabolism
Plant Extracts - metabolism
Protein-Lysine 6-Oxidase - metabolism
Tocotrienol-Rich Fraction from Annatto
Tocotrienols - metabolism
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Lysyl oxidase (LOX) is required for the formation of bone collagen cross-links. Inactivation of the LOX gene in osteoblasts by DNA methylation and JAK signaling has been reported to cause loss of cross-links and an increased risk of fractures. Tocotrienols (T3s) have proven benefits on bone strength, but their potential effects on LOX remain largely unknown. Thus, the present study investigates the in vitro effects of T3s on LOX expression in human osteoblastic MG-63 cells. Results indicated that Tocotrienol-Rich Fraction (TRF), the δ-T3 rich oil extracted from Annatto was the most effective and significantly increased LOX expression. TRF treatment decreased de-novo methyltransferases (DNMTs), DNMT3A and DNMT3B levels. In addition, TRF significantly inhibited JAK2 activation and decreased expression of Fli1, a transcription factor of DNMTs. We conclude that TRF induced an increase in LOX expression via inhibition of de-novo methylation and reduction of Fli1 expression by the inactivation of JAK2. Abbreviations: CpG: cytosine-guanine dinucleotide; DNMT: DNA methyltransferase; Fli1: friend leukemia virus integration 1; JAK: janus kinase; LOX: lysyl oxidase; PCR: polymerase chain reaction; STAT: signal transducers and activators of transcription; T3s: tocotrienols; TPs: tocopherols; TRF: Tocotrienol-Rich Fraction. TRF induced amelioration of LOX expression in MG-63 via inhibition of de-novo methylation through the reduction of Fli1 expression by the inactivation of JAK2.
ISSN:0916-8451
1347-6947
DOI:10.1080/09168451.2019.1693252